Synthesis of 1H-Pyrazolo[3,4-e]-s-triazolo[3,4-c]-as-triazines; 8H-Pyrazolo-
[3,4-e]tetrazolo[5,l-c]-as-triazine and 1,7-Dihydro-8H-pyrazolo[3,4-e]-s-
triazolo[3,4-c]-as-triazine Derivatives